I was just using my iPad retina mini charger to charge my new 6 plus. It got really hot. So I unwrapped the charger that came with the phone and put it on that and now it's charging cool. Of course my phone is new and may have been doing something in the background I wasn't aware of. And my mini battery drains fast these days so maybe there's something wrong with the charger, which also felt very warm while charging then phone. At any rate I'm sticking to the new charger for my new phone. I'm interested in reading what you more knowledgable forum members have to say. An engineer, I am most assuredly not.